Tạo Swipe Refresh Layout trong Android bằng Kotlin

Giới thiệu

Ví dụ này demo cách triển khai SwipeRefreshLayout (kéo để làm mới) trong Android dùng Kotlin.

Bước 1: Tạo dự án mới

Android Studio → File → New Project.

Bước 2: Layout (res/layout/activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Swipe to Reload"
            android:textColor="@android:color/background_dark"
            android:textSize="24sp"
            android:textStyle="bold" />

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</RelativeLayout>

Bước 3: Code Kotlin (src/MainActivity.kt)

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.widget.TextView
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout

class MainActivity : AppCompatActivity() {
    private lateinit var swipeRefreshLayout: SwipeRefreshLayout
    private lateinit var textView: TextView
    private var number = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        title = "KotlinApp"

        swipeRefreshLayout = findViewById(R.id.swipe)
        textView = findViewById(R.id.textView)

        swipeRefreshLayout.setOnRefreshListener {
            number++
            textView.text = " Total number = $number"
            Handler().postDelayed(Runnable {
                swipeRefreshLayout.isRefreshing = false
            }, 4000)
        }
    }
}

Bước 4: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://schemas.android.com/apk/res/android"
    package="com.example.q11">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

Chạy ứng dụng

Kết nối thiết bị, nhấn Run . Kéo xuống màn hình để thấy vòng tròn tải, sau 4 giây sẽ ẩn và cập nhật số đếm.